Signaling circuits



. D. A. QUARLES SIGNALING CIRCUITS Filed DSC. ll, 1922 far/es.

Patented Nov. `24, 1925.

f UNITEDl STATES OF ENGLEWOOD, NEW, JERSEY TRIO COMPANY, INCORPORATED, QF NEW YORK,

SIGNALING CIRCUITS. l

.Application led December 11, 1922. Serial Nol. 06,057.

To all whom t may concern.' Y

Be it known that I, DONALD A.. QUARLES, a citizen of the United States, residing at Englewood, in the county of Bergen, State of New Jersey, have invented certain new and useful Improvements in Signaling Circuits, of which the following is a full, clear, concise, and exact description.

This invention relates to signalingj circuits.

An object of this invention is to provide a transmitting and receiving set which may be employed to transmit and receive circuit or a one-way circuit.

Another object of this invention is to provide anoperators talking and monitor--y ing set which may be employed for talking and monitoring and a four-wire line without requiring the main transmission circuit to be broken when the operators set is in use. l

This invention is hereinafter described in detail as embodied in a supervisory circuit for a repeater station. at which a fourwire re eater line terminates in a two-wire line. [Es is well known in the art, two wires of the four-wire circuit are em loyed for transmission 'in one direction an the other two wires are employed for transmission in the opposite direction, the four wires being coupled by a suitable transformer arrangement with a two-wire line on which transmission may be had in both directions.

@ne transformer arrangement which may be employed for example, is that disclosed and claimed in the Nyquist application, Serial No. 481,319, tiled June 29, 1921 wherein separate transformers may be em ployed for coupling each side of the fourwii'e circuit to the two-wire line, a suitable balancing network being employed of course to balance the twowire line and prevent a local circulation of power from one side of the four-wire circuit to the v other.

` press talking currents both upon the out going side of the four-wire circuit as well as upon the outgoing two-wire line.

signals from either ya two way signaling both over a two-wire line` The transformer coupling between the' two-wire line and the incoming side of the four-wire circuit is also provided with` an additional winding which may be connected in circuit with the operators receiver whereby monitoring may be added both for messages coming in over the two-wire line as well as those received on the incoming side of the fourwire circuit. This arrangement therefore provides for talking and monitoring in both directions at a terminating station of a fourwire circuit without main transmission circuitv to any time and without transformers.

Referring to the drawing, a terminating four-wire repeater circuit is disclosed therein in which monitoring is obtained' by means of this invention.

Line 3 is a two-wire signaling line terminating in an artificial balancing line 4f and inductively coupled to the outgoing side 5 of a four-wire repeater circuit by a transformer 6, and coupled to the incoming side 7 of the said four-wire repeater circuit by another transformer 8.

Line 3 has connected in series therewith a winding 9 of transformer 6, a suitable condenser l0 and a winding 11 of transformer 8. The artificial balancing line 4 has connected in series therewith, a winding 13 of transformer 6, a condenser 14 and a winding 15 of transformer S. The outgoing side 5 of the four-wire circuit is connected to the winding 16 of transformer 6 while the incoming side 7 of the fourwire circuit is connected to the winding 17 of transformer 8. The impedances of line 3, artificial line 4 and the four-wire circuit may be so related by transformers 6 and 8 that a desired fraction such as one-half of the energy of signaling currents from line 3 will be impressed upon side 7 of the fourwire circuit and the other half will be impressed upon side 5, while none of the incoming energy will be absorbed by the artificial line Li. These impedance relations may also be such that one-half of the incoming energy from side 7 will be impressed upon line 3 and one-half absorbed by artificial line 4, but none of this energy will be impressed upon the outgoing side 5. The above described relation will, therefore, enable satisfactory signaling to be broken at requiring additional `ASSIGNOR '.I.O WESTERN ELEC- Y N. Y., .A CORPORATION 0F NEW requiring the take place between line 3 and four-wire circuit since incoming telephone signals, for example, from line 3 by transformer 6, will be impressed upon the outgoing side of the four-wire circuit, amplified by a suitable amplifier 20, and others not shown, whereby the signals from line 3 may be conveyed to any desired distant stations.

Similarly incoming signaling over line section 7 will be amplified by a plurality of repeaters such as the vacuum repeater 21 and by the transformer 8 the vamplified signals will be impressed upon line 3 and received by the station connected to 1the distant end thereof.

Transformers 6 and 8 are rovided with the usual transformer cores of some suitable magnetic material on which the various windings may be mounted. That the various windings of the two transformers need not be divided between the two transformers in the manner shown but may be divided in other ways will appear from the Nyquist application above mentioned.

In order to provide a talking and moni- .toring arrangement for the above described circuit this invention provides additional windings 22 and 23 mounted on the core of the transformer 6 so as to be inductive to both the primary windings 9 and 13. Leads 24 and 25 from these windings may be connected through suitable plugs and jacks to an operators transmitter 26. An'

operator or supervisor talking into transmitter 26 will cause speech current .potentials to be developed in windings 16, 9 and 13 of transformer 6 due to the inductive relations of these windings to the windings 22 and 23. vThe potential induced thereby in winding 16 will be amplified by repeater 20 and transmitted to the distant station connected to` line 5 in the same manner as incoming signaling currents from line o.

in windings 9 and 13, whereby signals fromV transmitter 26 will be impressed. partlyon line 3 and on network 4 but none will be absorbed by the side 7 of the four-wire circuit. The transmitter 26 is therefore available for supervisory purposes for talking either with the distant station connected to line 5 or the station connected to the other end ol' line '3.

In order to monitor those signals coming in over side 7 of the four-wire circuit as well as to monitor incoming signals from line 3 this invention provides additional windings 3() and 31 mounted on the core of transformer 8 so as to beinductively related to the other windings of said transformer, and these windings 3() and 31 by suitable leads and :-ft and plugs and jacks al connected in circuit with a telephone rec. er 35. As

described above one-half of the energy of the incoming signaling current from line 3 is absorbed by the outgoing side 5 of the fourwire circuit, and one-half by the incoming side 7 of the four-wire circuit so that since 'V ceiver 35 may therefore be employed for monitoring telephone currents in either direction while transmitter 26 may be employed for talkingpurposes in either direction, both the talking and the monitoring taking pla-ce without requiring the main transmissioncircuit to be broken in order to insert the main line any talking or receivingapparatus or any compensating networks that may be necessary by the connection of such apparatus. The monitorving arrangement on this invention is also inexpensive since no additional transformers are required to connect the transmitter and receiver to the transmission circuit. It is also to be noted that due to network 4 the transmitter 26 and receiver 35 are in antiside tone relation so that the receiverv does not get any of the energy fr 'omtransmitterv 26.

The windings 22 and 'li and 80 and 3l should be so designed that there is the proper matching of impedances between the transmitter and the impedance into which it works and between the incoming circuits for the receiver and the receiver in order to obtain maximum transmission efficiency.

It-visto be understood that the monitoring and talking arrangement of this invention may be employed in connection with other transformer means for coupling a two-way circuit to two one-way circuits without departing in any wise from the spirit of this invention as defined in the appended claims.

The invention claimed is:

l. In a signaling system, a two-way transmission line, a one-way transmission line, a second one-way transmission line, an artificial network for balancing said two-way line, transformer means for coupling said lines and said network to render said two way line, said first one way line, said second one way line and said network conjugate, an auxiliary winding on said transformer means coupled to other windings of said means to receive currents fronrieti'i said two-way lin-e and only the first of said onefor indicating lsig suc that alternating current potentials present in said second auxiliary winding impress currents on said two-way line and only on the secondof said one-Way lines, local means naling currents received by said first auxlliary winding, and local means for impressn signaling currents upon said second auxi 'ary winding.

2. In a signaling system, a two-Way transmission line, two oneway transmission lines, an artificial network for balancing said two-way line, fa transformer winding in circuit with said two-way line, a second transformer winding in circuit with said artificial network and inductively coupled to said first winding,'a third transformer winding in circuit with one of said one-way lines and inductively coupled to said first and said second windings, a fourth transformer winding inductivel coupled to said iirst three windings, a te ephone transmitter connected to said fourth winding, a fth trans'- former winding in circuit with said two-way line, a sixth transformer winding in circuit with said network, a seventh transformer winding connected to the other of said oneway lines, an eighth transformer winding inductively coupled to said fifth, sixth and seventh windings, and a telephone receiver d connected to said eighth winding.

3. In a signaling system, a two-way transmission line, a one-way transmission line, a second one-way transmission line, an arti ticial `network for balancing said two-wa line, a transformer winding in circuit wit said two-way line, a second transformer winding in "circuit with said network, a third transformer winding connected to said first'one-way line, said first and said third windings being mounted on a common core structure, said second winding being coupled to said first one-way line, an auxiliary winding mounted on said core, a telephone transmitter connected .to said auxili'ary windin a' fourth transformer winding in said circuit with said two-way line, ,a fifth transformer wind-ingin circuit, witlnsaidl nected to saidsecond one-way line, said?" fourth andsaid sixth windings bemg mounted, f on a common core, an auxiliary winding' rnounted'on said second core, and a telephone receiver connected to said last-mentioned auxiliary winding.

4. .A signaling system comprising a 'twowire line, an artificial network. for balancing said line, a four-wire repeater circuit having Awire line,

a unidirectional path for the transmission of signals in one direction and a second unidirectional path for transmitting the signals in the opposite direction, a transformer for coupllng said line Vto one of said paths, a second transformer for coupling said line to 'the'other of said paths, and an auxiliary winding lmounted on each of said transformers, a' telephone transmitter connected to one of said auxiliary windings and a telephone receiver connected to the other of said auxiliary windings.

5. A signaling system comprising a twoway transmission hne, an artificial network for balancing said line, a four-wire repeater circuit having a .unidirectional path for the transmission of signals in one direction and havin a second unidirectional path for transmlttingthe signals in the opposite direction, a transformer having one windinfr effectively in series with said line and said network and having a second winding connected to one of said paths, a second transformer having one winding connected e'ectively in series with said line and said nctf workl and a second 'winding connected to the other of said paths, an auxiliary winding mounted on each of said transformers a telephone transmitter connected to one of said auxiliary windings, and a telephone receiver connected to the other of said auxiliary windings.

6. A signaling system comprising a two.. way transmission line, an articial network for balancing said line, a four wire repeater circuit comprising two unidirectional paths, transformer means for inductively connecting said paths to said line and network, cores of magnetic material for said means,- a transmitter, a receiver, and means comprising monitoring windings on said cores for associating said receiver and said transmitter with said repeater circuit, said means arranged to make said receiver anti-side-tone to currents from said transmitter.

7. In combination a two wire line, a four coupled to said two wire line, a transmitter, a receiver, means for coupling said transmitter to said lines to impress currents upon said two wire line and on the outgoing side .of said four wire line, means l or 'coupling said receiver to receive currents from sald lines, and anartxclal network for balancing said two wire line and for rendering-,said receiver anti-side-tone.

In witnesvsjiwhereof, Il hereunto subscribe my name this 5th day of December A. D.,

DON ALD A. QUARLES.

Aloo 

